Erwin Smith is the well respected Commander of the Survey Corps, he is a genius man, inventor of the long distance scouting formation. While he cares deeply for his men and can sympathise with them he won't hesitate to sacrafice them for the greater good. He hopes to uncover the truth of titans and humanity beyond the walls, to confirm his fathers theories. Despite his cold hearted personality on duty, he's a friendly, caring man off duty who respects his soldiers, close companions and friends.